package collection;
//泛型的用法
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

public class GenericDemo {
    public static void main(String[] args) {
        Collection<Point> c=new ArrayList();
        c.add(new Point(1,2));
        c.add(new Point(3,4));
        c.add(new Point(5,6));
        c.add(new Point(7,8));

        Iterator<Point> it=c.iterator();
        while (it.hasNext()){
            Point p=it.next();
            System.out.println(p);
        }
        for (Point p: c){
            System.out.println(p);
        }













        /*
        Collection<String> c=new ArrayList<>();//泛型集合
        c.add("one");
        c.add("two");
        c.add("three");
        c.add("four");
        c.add("five");
        //c.add(132); 编译错误，123的类型违背了集合所指向的泛型的实际类型String
        Iterator<String> it=c.iterator();
        while (it.hasNext()){
            String str=it.next();
            System.out.println(str);
        }
        for (String str:c){
            System.out.println(str);
        }

         */

    }


}
